Typewriting machine



J. wALDHElM 'NIPIEWRITINCvv MACHINE Feb. 15, 1927.`

Filed May 4, 1925 3 Sheets-Sheet 1 ai y Q54 7/ lnvenfor:

v *y- Aromey- I 1,617930 Feb. 15,1927. JWALDHEIM TYPEWRITING MAcHINE Filed May 4, 1925 3 Sheets-Sheet 2 lnvenfor:

,M /6/ 23 v v Z5' Arorney operated, while still maintaining the visibility of the work-sheet in the casino.

In sound-deadening casings having a front opening it has been found that it considerably increases the efficiency of the cabinet to have the sound-absorbing walls as near as possible to the noise-producing parts. The quicker the sound waves are absorbed the less chance they have to find their way to the outside through the opening in front of the casing. In this invention the lower walls under the car iage forming the carriage-extensions at the sides of the pack form a conveX closure closely fitting the carriage of the machine, a feature considerably increasing the efficiency of the casing.

In one form the present invention provides for the adapting of the casing to Inachines having a tabulating device. Said device includes a tabulating stop at the rear of the machine frame, and to this end the rear wall of the pack is provided with an opening to clear the stops.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a cross-sectional view in elevation of the sound-deadening casing enclosing an Underwood standard typewriting machine.

Figure 2 is a front view in elevation, showing the margin stop devices of the machine and the front plate attached to the casing.

Figure 3 is a perspective view of the casing with the machine removed therefrom.

' Figure a is a side view in elevation of the sound-deadening casing, showing the machine therein and the cover swung back to its open position.

Figure 5 is a disinembered perspective view of the sound-deadening casing.

Figure G is a perspective view of the bodypart of the casing, showing a modification arranged to receive a typewriting machine having tabulating keys.

The Underwood standard typewriting machine comprises a main frame 10 supported by feet 11, and has a forward eXtension 12 carrying banks of keys 13 to cause type-bars to strike a platen le when the keys are depressed. rEhe platen is revolubly mounted upon a carriage 15 mounted for letter-feed movement upon rails borne by the frame of the machine.

VMachines of this general character are noisy in operation, and it is for the purpose of deadening the noise arising from the operation thereof that this sound-deadening casing is provided.

The sound-deadening casing comprises broadly a lower pack 16, a cover or canopy 17 and a front closure 18 fast to the frame of the machine. Forming an integral part of the pack 16 and at the rear thereof there is provided a pocket 19 to accommodate the overhanging unused portion of a work-sheet 20. The pack is designed to closely tit the frame of the machine, and comprises a rear wall 21, two side walls and a bottom wall or sole 23. In line with the rear wall 21 and extending therefrom there are provided walls 24 forming the continuous front wall of the pocket 19 at the rear of the pack. From said front wall, extending rearwardly, and forming an integral part thereof, there are provided end walls 25 which are joined together at the rear thereof by a rear wall 26 for completely enclosing the pocket. The bottom wall or floor 2T of the pocket forms a continuous surface with the sole of the pack, as shown in Figure 1. Both the pack and 'the pocket are lined with a layer of sound-deadening material, such as felt, and is generally indicated in the drawings by the numeral 28. The function of the felt lining in the pack is to absorb the sound waves emanating from the operation of the machine, and to present a yielding surface to the frame of the machine to thus effectively hold the machine in the pack. The felt lining 28 upon the wall 26 of the pocket eX- tends upwardly from said wall as shown in Figure 5, in which the extension is indicated by the numeral 30. To facilitate the insertion of the work-sheet around the platen, and to prevent the leading edge 29 of the worksheet from being obstructed by the upper edge of the felt lining, the latter is beveled at 31.

rIhe cover 17 is pivotally mounted upon screws 82 fast to the end walls 25 of the pocket 19. The fulcrum point of the cover is so placed upon side walls 32 that the cover will be held by its own weight either in its closed position or in its open position shown in Figure 1. In order to limit the travel of the cover, there is provided a pin 33 fast to one of the endL walls 25 engaging with a circular slot Se in one of the side walls of the cover. rvI`he two side walls are joined together by a curved top 35 forming an integral part of said side walls. The top 255 slopes downwardly toward the front thereof, and at the rear is bent downwardly and terminates with a vertically disposed rear wall 36 overlapping the upslanding portion 30 of the felt lining 2S.

In order to render the machine operable from the outside of the casing, es aecially for such operations as the returning and positioning of the carriage and the linespacing of the platen, without--necessitating the displacement of the cover at each operation, there is provided an opening or slot in front of the casing extending the full width of the casing, through which opening the hand may be thrust to reach the carriagecontrolling levers, and then the hand is slid along the slot to move the. carriage. Sounddeadening casings have been provided with an opening at the front thereof wide enough to 4render the work-sheet visible and to render'the machine operable. In this kind of casing much more of the casing thanwas strictly necessary to render the machine operable had to be left open iii order to render the printing point visible. In this invention an effort has been made to reduce the size of the opening, and to this end there is provided a glass plate 37 fastened to the top of the cover by means of clamping pieces 38 and screws 39. Said glass plate over-eX tends the side walls of the cover and is provided with a ground edge 40 to prevent injury to the hand when the same is moved along the opening t-o return the carriage. In this manner itis possible lto reduce the size of the slot or opening in front of the casing to just the amount required to operate the machine, the visibility of the work-sheet being obtained through the glass plate.

In accordance with one of the features of this invention the lower walls 4l of the carriage pockets are designed to closely fit t-he outline of the carriage to thus absorb the sound waves emanating from the operation of the machine as near as possible to their source. Said lower walls form an integral part of the pack and extend outwardly from the side walls thereof. Referring more particularly to Figure 5, it will be noted that the walls 4l extend rearwardly, forming a convex curvature 42, and terminate with flat portions 43 in line withythe top edge of the end walls 25 of the pocket 19. It will also be noted that front edges 44 of the walls 41 are provided with folded ribs 45 to control and hold the edge of the felt lining 28 which covers said walls.

The lcover 17 is lined Vwith a layer 47 of sound-deadening material. Said lining is glued or otherwise secured to the walls of the cover and extends downwardly overlapping the sides of the casing to seal the joint between the two members. The side walls 32 o-f the cover are bent outwardly at 48 to make room for the felt lining 47. In order to facilitate the opening and closing of t-he cov-er, there is provided an angular piece 49 fast to one of the sides of the cover by means of fasteners 50.

'In the Underwood machine there are provided marginal stops 51 slidably mounted upon a rod 52 in front of the machine. Said stops are operable from the outside of the machine by means of handles 53, and in this manner the stops may be positioned to control the length of the lines upon the worksheet. In this invention an effort has been made to retain the advantage of easily adjusting the marginal stops while at the same time .sealing the opening under the stops and thus prevent the leakage of sound waves therethrough. To this end there is provided afplate54 attacha'ble to the frame of vthe machine by means of screws 55 Itting into tapped holes in the frame. The plate is lined with a piece of felt 56 overeXtending the plate at the top thereof. Said extension, vindicated by the numeral 57, is

curved inwardly under the stops as shown in `rFigure l. The upper edge 5S of the felt extension 57 is designed to normally bear under the stop carrying rod 52 but when the stops are `moved the edge 58 yields to per-mit the passage of the stops and then springs back to its normal position as shown inY Figure 2.

In order that the plate maybe fastened ,to or removed from the machine without necessitating the previous removing of t-he ribboncontrol keys 59, while at the same time retaining the advantage of being able to operate the keys `from the outside of the casing, there is provided a slot 60, `said slot having an enlargement 6l which serves as a clearance for the key-travel-limiting pin 62 fast to the key-lever 63.

In order 'thatthe sound-'deafdening casing may accommodate typewriting machines having a tabulating mechanism including tabulating stops at the rear of the machine frame, a modification of the present invention is illustrated in Figure 6, in which `the rear wall of the lpack 16 is provided with an opening 64 to clear the tabulating mechanism. Otherwise, the construction of the pac-k illustrated in Figure 6 is t-he same as the pack 16 and consequently the. designating numerals are identical in both packs.

It will benoted, among other things, that the hood or canopy is provided across the front thereof with a hand-opening, through which the usual standard machine carriage controls may be manipulated, and any standard machine may be set into the sound-deadening casing without special elongated carriage-controlling levers; that the glassed-in cover overhangs the front of the canopy and has no front glass-enclosing rail to obstruct the vision of the operator; and that the front plate that bridges the .sound-deadening machine-enclosure at the front thereof has a. pliable sound-absorbing longitudinal edge to engage the machineframe, and becomes .self-adjusting to any inequalities in the frame and to any variations in the height of the margin-stop devices from the rubber feet in different machines.

Variations may be resorted to within the scope of the invention, and porti-ons of theimprovements may be used without others.

I-Iaving thus described my invention, 'I claim:

l. A sound-deadening casing for a typewriting machine including a body-part, a hood and a front plate, the body-part including rear-and side walls Vforming a `threellO sided machine-enclosure closely .fitting the frame of the machine, and carriage-receiving enclosures at each side of the machineenclosure, the hood being swingably mounted upon the body-part to cover and uncover the machine-enclosures, and the front plate being detachably secured to the front wall of the machine to bridge the machine-enclosure.

2. A sound-deadening casing for a type- Writing machine having a carriage and carriage-controlling mechanisms, said casing including a machine-pocket to enclose the frame of the machine on three sides, a carriage-receiving pocketl at each side of the machine-enclosing pocket, and a hood swingable over the casing to cover all the pockets, said hood when closed forming a. longitudinal hand-opening through which the usual carriage-controls maybe manipulated at any position of the carriage.

3. The combination With a typewriting machine having a carriage arranged for letter-space travel and having marginal stops in front of said carriage to limit the longitudinal travel thereof, of a sound-deadening casing comprising a body-part a cover pivotally mounted on said body-part, the cover having an opening at the front through which the carriage may be n'lanipulated, and a front closure having a felt lining fastthereto and overerztending the top thereof, said extension serving as means to seal the opening under the marginal stops.

Ll. The combination with a typevvriting machine having a carriage arranged for letter-space travel and having marginal stops in front of said carriage to limit the longitudinal travel thereof, of a sound-deadening casing comprising a body-part, a cover pivotally mounted on said body-part, the cover having an opening at the front through ivhichrthe carriage may be manipulated, and a front closure having a felt lining fast thereto and overextending the top thereof, said extension serving as means to seal the opening under the marginal stops, the cover being provided with a glass plate fast thereto and in the line of vision of the operative, through Which glass plate a Work-sheet rendered visible Without displacei'nent of the cover.

5. The combination With a typenfriting machine having a carriage arranged for letter-space travel and having marginal stops in front of said carriage to limit the longitudinal travel thereof, of a sound-deadening i casing comprising a body-part, a cover pivotally mounted on said body-part, the cover having. an opening 'at the front through which the carriage may be manipulated, and a front closure having a felt lining fast thereto and overextending the top thereof, said extension serving as means to seal the opening under the marginal stops, the front closure being fast to the frame of the machine independently of either the body-part or the cover and bodily removable with the machine.

6. The combination With a tyliieivriting machine having -a carriage arranged for letter-space travel. and having marginal. stops in front of said carriage to limit the longitudinal travel thereof, of a sound-deadening casing comprising a body-part, a cover pivotally mounted on said body-part, the cover having an opening at the front through which the carriage may1 be manipulated, and a front closure having a felt lining fast thereto and overextending the top thereof, said extension serving as means to seal the opening under the marginal stops, the front closure being provided vvith a clearance slot for engagement vith the shaft of a ribboncontrol-hey operatively mounted on the machine-frznne, and with means to render the front closure 'attache-ble to and removable from the machiiie-frame.

7. fr sound-ueadening casing for a typevvriting machine having a traveling carriage, said casing including a sound-deadening machine-enclosure to encase three sides of the machine-frame, a sound-deadening insert to partially close up the front of the n1achine-enclosure, open-ended sounddeadeniug Wings merging with both sides of the inachine-enclosure to accommodate the travel of the carriage, and a canopy to cover the casing and close the ends of the wings.

8. fr souiul-deadening casing for a typevsriting machine having a traveling carriage, said casing including a sound-deadening machine-enclosure to encase three sides of the machine-frame, a sound-deadening insert to partially close up the front of the inachine-enclosin'e, open-ended sounddeadening wings merging with both sides of the machine-enclosure to accommodate the travel of the carriage, and a canopy to cover the casing and close the ends of the wings, said canopy having an open front to give access to the carriage.

9. A souiul-deadening casing for a type- Yriting machine having a traveling carriage, said casing including a sound-deadening machine-enclosure to encase three sides of the machine-frame, a sound-deadening insert to partially close up the front of the machine-enclosure, open-ended sounddeadening wings merging with both sides of the machinc-enclosure to accon'imcdate the travel of the carriage, and a canopy to cover the casing and close the ends of the wings, said canopy having an open front to give access to the carriage, and a glassed-in topopening to expose the carriage.

l0. fr sound-deadening casing for a type- Writing machine having a traveling carriage: said casing including a sound-deadening ma- 

